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Study on CO-SCR performance of Ce modified OMS-2 catalysts

Chen Cai, Jiayin Chen, Wei Fu, Shuying Ning, Hao Zhou, Muhammad Kashif (UGent) and Yaxin Su
(2023) JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING. 11(6).
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Abstract
The Ce-modified OMS-2 catalyst (Cex-OMS-2) was synthesized by the hydrothermal synthesis method, after which its catalytic efficacy in the selective reduction of NO by CO was assessed. The experiments showed that Ce0.08-OMS-2 was capable of 100% NO conversion between 175 and 300 °C when 0.05%NO, 0.1%CO, 5%O2 and N2 were used as equilibrium gases, and the N2 selectivity peaked at 93.2% at 175 °C. Additionally, Ce0.08-OMS-2 exhibits good sulfur resistance in the presence of 0.02% SO2 and maintains more than 88% NO conversion at 175–275 °C. By using BET, XPS, H2-TPR, NH3-TPD, and In situ DRIFTS to characterize the catalysts, the effects of doping the active metal Ce on the physicochemical characteristics of OMS-2 catalysts were under investigation. In conclusion, the improvement of the low-temperature activity of the Cex-OMS-2 catalyst is facilitated by lower agglomeration and crystallinity, larger specific surface area, smaller average pore size, enhanced surface oxygen vacancies, increased Mn4+ concentration, and richer Brønsted acid. Reaction gas adsorbed species and intermediates on the catalyst surface were dynamically captured during In situ DRIFTS experiments. The CO-SCR reaction of the catalyst was found to follow the E-R mechanism below 200 ℃ and the L-H mechanism at 200–350 ℃.
Keywords
NOx emission CO-SCR, Ce-OMS-2 catalysts, In situ DRIFTS, reaction mechanism, OCTAHEDRAL MOLECULAR-SIEVES, NO REDUCTION, MANGANESE OXIDES, LATTICE OXYGEN, DOPED CEO2, OXIDATION, EFFICIENT, ADSORPTION, NH3, NH3-SCR

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MLA
Cai, Chen, et al. “Study on CO-SCR Performance of Ce Modified OMS-2 Catalysts.” JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, vol. 11, no. 6, 2023, doi:10.1016/j.jece.2023.111589.
APA
Cai, C., Chen, J., Fu, W., Ning, S., Zhou, H., Kashif, M., & Su, Y. (2023). Study on CO-SCR performance of Ce modified OMS-2 catalysts. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, 11(6). https://doi.org/10.1016/j.jece.2023.111589
Chicago author-date
Cai, Chen, Jiayin Chen, Wei Fu, Shuying Ning, Hao Zhou, Muhammad Kashif, and Yaxin Su. 2023. “Study on CO-SCR Performance of Ce Modified OMS-2 Catalysts.” JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 11 (6). https://doi.org/10.1016/j.jece.2023.111589.
Chicago author-date (all authors)
Cai, Chen, Jiayin Chen, Wei Fu, Shuying Ning, Hao Zhou, Muhammad Kashif, and Yaxin Su. 2023. “Study on CO-SCR Performance of Ce Modified OMS-2 Catalysts.” JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 11 (6). doi:10.1016/j.jece.2023.111589.
Vancouver
1.
Cai C, Chen J, Fu W, Ning S, Zhou H, Kashif M, et al. Study on CO-SCR performance of Ce modified OMS-2 catalysts. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING. 2023;11(6).
IEEE
[1]
C. Cai et al., “Study on CO-SCR performance of Ce modified OMS-2 catalysts,” JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, vol. 11, no. 6, 2023.
@article{01HMZW7S3471NAZ27ZAC9XFCC3,
  abstract     = {{The Ce-modified OMS-2 catalyst (Cex-OMS-2) was synthesized by the hydrothermal synthesis method, after which its catalytic efficacy in the selective reduction of NO by CO was assessed. The experiments showed that Ce0.08-OMS-2 was capable of 100% NO conversion between 175 and 300 °C when 0.05%NO, 0.1%CO, 5%O2 and N2 were used as equilibrium gases, and the N2 selectivity peaked at 93.2% at 175 °C. Additionally, Ce0.08-OMS-2 exhibits good sulfur resistance in the presence of 0.02% SO2 and maintains more than 88% NO conversion at 175–275 °C. By using BET, XPS, H2-TPR, NH3-TPD, and In situ DRIFTS to characterize the catalysts, the effects of doping the active metal Ce on the physicochemical characteristics of OMS-2 catalysts were under investigation. In conclusion, the improvement of the low-temperature activity of the Cex-OMS-2 catalyst is facilitated by lower agglomeration and crystallinity, larger specific surface area, smaller average pore size, enhanced surface oxygen vacancies, increased Mn4+ concentration, and richer Brønsted acid. Reaction gas adsorbed species and intermediates on the catalyst surface were dynamically captured during In situ DRIFTS experiments. The CO-SCR reaction of the catalyst was found to follow the E-R mechanism below 200 ℃ and the L-H mechanism at 200–350 ℃.}},
  articleno    = {{111589}},
  author       = {{Cai, Chen and Chen, Jiayin and Fu, Wei and Ning, Shuying and Zhou, Hao and Kashif, Muhammad and Su, Yaxin}},
  issn         = {{2213-2929}},
  journal      = {{JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING}},
  keywords     = {{NOx emission CO-SCR,Ce-OMS-2 catalysts,In situ DRIFTS,reaction mechanism,OCTAHEDRAL MOLECULAR-SIEVES,NO REDUCTION,MANGANESE OXIDES,LATTICE OXYGEN,DOPED CEO2,OXIDATION,EFFICIENT,ADSORPTION,NH3,NH3-SCR}},
  language     = {{eng}},
  number       = {{6}},
  pages        = {{12}},
  title        = {{Study on CO-SCR performance of Ce modified OMS-2 catalysts}},
  url          = {{http://doi.org/10.1016/j.jece.2023.111589}},
  volume       = {{11}},
  year         = {{2023}},
}
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